Lighting fixture and the like



Dec. 4, 1928.

D. HOLT LIGHTING FIXTURE AND THE LIKE Filed May 23, 1927 2 Sheets-Sheet 1 Dec. 4, 1928. 1,693,925

D. HOLT LIGHTING FIXTURE AND THE LIKE Filed May 25, 1927 2 Sheets-Sheet 2 jam ZJ Zo/f,

Patented Dec. 4, 1928.

UNITED STATES DONALD HOLT, OF CHICAGO, ILLINOIS.

LIGHTING FIXTURE AND THE LIKE.

Application filed May 23,

This invention has to do with certain improvements in lighting fixtures. The lighting fixtures herein disclosed are of the general type in which use is made of a bracket arm provided with proper supporting means whereby one end is supported upon or attached to any suitable article of support such as a desk, table, wall, machine tool, lathe, or othersupport whatsoever.

The features of the invention have reference particularly to the construction of the bracket arm, and the manner in which the various sections thereof are related to each other and retained in proper harmonious relationship. The invention also relates to the manner in which the different sections of the arm are connected or joined together; and more particularly, to the construction disclosed whereby said sections are provided with the necessary co-operation to insure the desired amount of frictional engagement between them to retain them in whatever relative position may be decided upon.

A further feature of the invention relates to the provision of a construction such that the various sections may be adjusted with respect to each other without an excessive amount of binding between them and constructions such that the relative movements between the sections will be smooth and continuous as distinguished from a jerky or otherwise discontinuous movement.

A further feature of the invention relates to the provision of a structure of such -form that it can be readily made up from sheet metal stampings or punch press parts; and a so of such construction that the parts may e very cheaply manufactured in quantities'i and may be readily assembled at a very low labor cost. A further object of the invention is to provide a structure which will be very durable and well adapted to withstand the relativel rough service which is often encol'intered )y devices of this kind.

Other objects and uses of the invention will appear from a detailed description of the same which consists in the features of construction and combinations of parts hereinafter described and claimed.

In the drawings:

Fig. 1 shows a side elevation of a bracket arm embodying the features of the present inventiomthe fixed end of the same being supported upon a suitable desk or other article of furniture;

1927. Serial No. 193,554.

Fig. 2 shows a plan view corresponding to Fig. 1;

Fig. 3 shows a detailed side elevation of the pedestal section on enlarged scale (and partly in section) as compared to. Figs. 1 and 2;

Fig. 4 shows a cross section on the line 4-4 of Fig. 3 looking in the direction of the arrows;

Fig. 5 shows a detailed side view partly in section showing one of the intermediate joint members;

Fig. 6 shows a cross section on the line 66 of Fig. 5 looking in the direction of the arrows;

Fig. 7 shows a detailed face view of the friction washer used in the pedestal section;

Fig. 8 shows a detailed section on the line 88 of Fig. 4 looking in the direction of the arrows; 1

Fig. 9 shows a detailed view of a modified form of the pivotal tie bolt joining the cup members together; and

Fig. 10 shows a fragmentary section on the line 1010 of Fig. 5 looking in the direction of the arrows.

Referring first to the general views shown in Figs. 1 and 2, the device herein disclosed includes a basesection 12, together with a suitable number of arm sections 13 and let (two being illustrated inthe figures), said arm section 13 being flexibly connected to the pedestal section 12 by the joint section 15; and the arm sections being flexibly joined together by the joint vsection 16. A suitable lamp socket 17 is connected to the arm sec-- tion 14 by the joint section 18; and the lam socket 17 may or may not be provided wit 1 a shade 19 or the equivalent as illustrated in the drawings.

The joint sections 15, 16 and 18 are of such construction that they permit relative movements on axes extending transversely thereto; and in addition to the foregoing the joint section 15 is so constructed as to permit of swinging movements about a vertical axis extending through the pedestal section 12. The details of all of these parts will now be described.

Referring to Figs. 3 and 4, the pedestal section 12 includes a base member 20 of suitable form. This base member in the form illustrated is provided with a series of holes 21 for the accommodation of screws or bolts whereby said. base section is too clamped or secured to a table, desk, machine tool, lathe or other support. In its central portion the base 20 has tin-upstanding boss 22 which is centrally perforated to receive a through pin 23. The upper end of this pin 23 is flared to rovide the head 24. A sleeve 25 encircles t e pin 23 above the position of the boss and serves as a means for connecting the joint member 15 to the pin.

The lower end of the pin is threaded to receive a nut 26 within the pedestal member; and upon tightening up this nut to the limit of the threads on the pin, a friction washer 27 is sufliciently clamped against the bottom of the pedestal to create the desired amount of frictional engagement between the parts. The lower portion of the pin 23 is flattened out at one or more points, and the washer 27 is provided with a hole having similarly flattened sides 28 as shown in 27 so that the washer and pin 23 are retained against rotation with respect to each other.

The base or pedestal member 20 is socketed on its under side to establish av bearing surface 29 for the washer, and also to accommodate the washer and lock nut 26 above the surface of the table or other device upon which the pedestal is mounted.

The arms 13 and 14 are conveniently made of lengths of metal tubing. Each of the joint members 15, 16 and 18 comprises a air of spun or pressed cups of companion orm as clearly indicated in Figs. 4 and 6. Considering for example the joint member 15, the same includes the companion cups 30 and 31, the edged portions of which are slightly telescoped and are slightly flared or otherwise to establish the necessary relationship. The cups are also centrally dished since their central portions do not need to be as far separated from each other as their peripheral portions.

The sleeve 25 is made of sheet metal folded around into a complete circle and having its ends brought together into the form of a pair of parallel and co-incidental ears 31 and .32. These project out a suflicient' distance to establish the desired amount of separation of the joint members 15 from the position of the pedestal; and then the ears are flared sidewise into a common plane in the form of companion lugs 33 and 34 as best shown in Fig; 3. The ends of these lugs are in turn again folded at right angles in the form of extensions 34 and 35 which pass through companion holes in the peripheral portion of the disk 30. Said extensions are upset at their inner ends after they have passed through said holes so as to thereb rivet the same to the disk 30 in a very fami iar manner. In addition thereto the ears 33 and 34 may also be flatly riveted against the disk 30 by rivets 36 and 37 in the well understood manner.

From the foregoing it will be seen that the disk 30 of the joint member 15 is very securely connected to the sleeve 25 but owing to the spring effect of the washer 27 the parts can readily be turned around on the pin 23.

The two slightly telescoping disks 30 and 31 are centrally perforated. A stud 38 reaches through the central perforations aforesaid, said stud having one end enlarged to provide a head 39 against which the disk 30 comes to seat. The other end of stud 38 is squared or flattened as shown at 40 in Fig. 8, the perforation in the disk 31 being similarly shaped so that the stud and the disk 31 are prevented from rotating with respect to each other. A shoulder 41 is formed on the stud adjacent to its flattened portion, so that the nut 42 may be drawn up solid against said shoulder and at the same time come to hearing against the disk 31. The parts are so proportioned that this result is made possible whereby the nut 42 and stud are solidly locked together.

Intermediate between the peripheral portions of the two disks there is placed a rubber or other companion washer 43. This is of such a thickness that when the nut 42 has been tightened up against the shoulder a compression is exerted upon the washer 43 thereby creatin a frictional engagemnet between said washerand both of the disks 30 and 31. The amount of this frictional engagement will necessarily depend upon the various factors, among which is the amount by which the central portions of the disks must be forced together after the contact with the washer has been established.

If desired two or more thicknesses or laminations of washer may be used instead of a single thickness as illustrated; or in some cases it may be found desirable to place thin metal shims or plates against the faces of the washer so as to establish the bearing surfaces against the disks 30 and 31.

The stud 38 is preferably perforated as shown in the figures so as to accommodate the wire or wires which conduct the current.

The other disk 31 of the pedestal is provided with clamping sleeve 44 similar in construction and arrangement to that of the sleeve 25; and said sleeve 44 serves to effectively and firmly clamp the end portion of the tube 45 which constitutes the tubular section 13 already referred to. Furthermore, the end portion of the tube is preferably upset slightly as shown at 46 in Fig. 4 as the parts are assembled so as to lock them more securely together.

In connection with the foregoing act of lockin 'the sleeve 44 to the end portion of the tu e 45, reference may also be had to the details represented in Figs. 5 and 10, which are ty ical of such an arrangement. Therein it Wlll be noted that the side portions of the tubing are pinched at diametrically opposite points to establish a pair of small cars 47 and 48 which are then accommodated within shallow notches 49 and 50 in the end portion of the sleeve. By this means the tubing is prevented from turning within the sleeve and at the same time the tube isprevented from drawin len thwise along the sleeve. \Vhen the en of the tube is upset or riveted as shown at 46 the shifting of the tube is resisted by the engagement of ears 47 and 48 with the notches in the sleeve.

It is also preferred that a suitable bushing 51 of fibre or other composition material be driven into each end of the tubular sections 13 and 14. This will effectively protect the wires entering and leaving the tubular sections, thereby reducing the tendency to abrade and wear said w1res as well as reducing danger of short circuits, etc.

The joint sections 16 and 18 are similar inform and construction to the joint section 1.5 and therefore it is not deemed necessary to describe them in detail. Furthermore, the attachment of the lamp socket 17 to the joint section 18 is established by the use of a structure similar to the sleeve construction already described.

After the different sections have been assembled into the complete bracket a suit,- able conductor 52 may be run through the entire series of sections, being passed through the centrally perforated studs and through the bushings of the tubular sections in the proper sequence, as will be readily un derstood particularly from Figs. 1 and 2.

It will be understood that the structure herein described establishes a great deal of flexibility in the device as a whole, making it possible to readily turn the parts into such )ositions as may be desired from time to time. Nevertheless the frictional engagements established' in the various joint sections will effectively prevent movement at these points except upon the exertion of an excessive amount o orce.

If desired a. modified form of construction may be used in the joint sections in place of the rubber or composition washers previously described. For example, as shown in Fig. 9 a steel disk washer 53 may be placed between the cup sections 30 and 31, thereby establishing the necessary frictional contact in place of using the rubber washer arrange-- ment.

While I have herein shown and describedonly certain embodiments of the features of my present invention, still I do not intend to limit myself thereto except as I may do so in the claims.

I claim:

1. A device of the class described comprising in combination a pedestal member a vertical pin extending through and pivoted within the same to turn on a vertical axis, a clip surrounding and pivotally mounted each other to thereby bring the disks into frictional engagement with the rubber block aforesaid, a rigid connection between one of said disks and the clip aforesaid, a. clip secured to the other of said disks, a hollow extension arm secured to said clip, and a suitable conductor extending through the hollow pivotal joint connection and throu h the hol ow tubular extension, substantiafiy as described.

2. In a device of the classdescribed the combination with a suitable esta-l member of a pedestal joint comprising a pair of co-operatmg .disks, a. pivotal tubular tension connection between the central portions thereof, a circular friction member between the annular portions of said disks, a suitable connection bet-ween one of the disks and the pedestal member, an extension arm, and a suitable connectionbetween the same and the other of said disks, substantially as described.

3. In a device of the class described the combination with a. pair of members which are to be pivotally connected together, of a joint member comprising a pair of co-operating slightly dished telescoping disks having outwardly extending peripheral annular recesses,'a pivotal member joining together the central portions thereof, an annular rubber block located between the recessed peripheral portions of said disks, and in frictional engagement with the inner surfaces of said recessed portions, and suitable connections between said disks and the members which are to be pivotally connected together, substantially as described.

4. In a device of the class described the combination with a pair f members which are to be rotatably COIIDGLLGd together, of a pair of disks, a central pivotal connection between said disks comprising a stud having an abutment in contact with the outside surface of one disk, means for causing said stud to be non-rotatable with respect to the other disk, a locking device on the end of the stud engaging the last mentioned disk, means for establishing a frictional resistance intermediate between the disks, and suitable connections between the disks and the members which are to be connected together, substantially as described.

5. In a device of the class described the combination with a suitable joint member including a sheet metal plate, of a one piece clip secured to said plate and comprising a circularly folded central portion together with a pair of integrally formed outwardly extending ears terminating in forwardly reaching lugs, suitable perforations in the plate for the accommodation of said lugs, said lugs being riveted into said perforations, a notch in one edge of the circularly folded portion aforesaid, a tubular extension reaching through said circularly folded portion, an ear on said tubular extension engagin said notch, and the end portion of the to ular extension being upset or riveted,

substantially as described.

DONALD HOLT. 

